Nut lock blank



J y 1939 w. A. BERGSTRQM 2,164,305

NUT LOCK BLANK Filed Oct. 14, 1937 Patented July 4, 1939 UNITED STATES NUT LOCK BLANK William A. Bergstrom, Chicago, Ill., assignor to Renchtite Spring Nut Company, San Francisco, Calif., a corporation of California Application October 14, 1937, Serial No. 168,992

Claims.

or damaged by the cutting tool or element during 10 the slotting operation or its initiation.

With the above and other objects in view, as

will be apparent, this invention consists in the construction, combination and arrangement of parts, all as hereinafter more fully described,

claimed and illustrated in the accompanying drawing, wherein:

Fig. l is a plan elevation of a nut embodying the present invention;

Fig. 2 is a side elevation of a nut constructed in accordance with the present invention;

Fig. 3 is a sectional view thereof taken along line 3-3 of Fig. 1, showing theslot of the nut in dotted lines;

Fig. 4 is a plan view of a nut embodying a modified form of this invention;

Fig. 5 is a view similar to Figs. 1 and 4 illustrating a nut blank embodying further modification of this invention;

Fig. 6 is a sectional view taken along line 6-6 of Fig. 5;

Fig. 7 is a view similar to Figs. 1, 4 and 5 disclosing the effect of combining the form of the invention shown in Fig. 5 with either the form thereof illustrated in Fig. 1 or that of Fig. 4;

.55 and Fig. 8 is a sectional view thereof taken along line 8-8 of Fig. 7.

In the making of slotted nuts such as contemplated by the present invention, the slots are placed therein by rotary cutters, discs or tools,

which in general initially contact the blank being treated at a corner formed by a junction between two side faces of the blank. Since the slot is usually angularly disposed with respect to all of the several faces of the blank, the latter is so held during the slotting operation that the portion thereof first contacted by the cutter is at an angle both to the plane of the cutter itself and to the horizontal and vertical planes.

Without the present invention being embodied in the nut blank the cutter, in contacting the blank, frequently would have a tendency to ride or move downwardly at the'point of contact with the blank before having an opportunity of starting the cut. This would warp or bend the cutter laterally and not infrequently cause it to break. In addition such tendency of movement by the cutter along an inclined part ofthenut blank would result in an inaccurate placement of the slot, inscoring or otherwise mutilating the nut 5 blank, and in misdirecting the slot with reference to 'the other elements of the blank.

The present invention proposes to incorporate in the nut blank means whereby any tendency on the part of the cutter to move laterally with 10 respect to the blank is overcome and said cutter will enter the body of the blank at the point of initial contact, thus eliminating the objections arising in slotting a nut blank which is not provided with the present invention, 16

Reference being had more particularly to the drawing 10 designates a nut, of any standard shape and size, having the inner or lower face H, the outer or upper face 12 and the side face or faces I3. The shape and size of the nut forms 20 no part of nor has it any effect on the adaption of the present invention, which may be applied as readily to an octagonal nut as it can be to a hexagonal nut, and as readily to the latter as to a square or rectangular nut. The nut 10 is also 25 provided with the customary central threaded bore 14.

A portion 1 5 of the inner or lower face I I of the nut is parallel to its outer or upper face 12 and at right angles to the axis thereof. The 30 remainder 16 of the inner or lower face II is inclined outwardly at an angle from the inner extremity of the portion I5 thereof thereby increasing the thickness of the nut as the side face or faces 13 opposed to the portion 15 of the 35 inner face H is approached.

The slot ll enters the body of the nut ill at the thicker side thereof and angles upwardly to intersect the bore 14 and extend to or beyond the axis thereof. For the purposes of the present invention the slot 1 I may be of any suitable shape and size and may occupy any relative position within the body of the nut, though to be effective as a lock nut the slot should be positioned between the outer face I2 and the angularly dis- 45 posed portion l6 of the inner face H and extend into the body of the nut from the thicker side face thereof. The slot I1 is placed in the nut 10 by a rotary cutter or abrasive disc and because of the angular position of said slot within the nut 0 the blank to be slotted must be fed to the cutter or disc in a cooked or angular position, such as in the position illustrated in Fig. 3. Thus the cutter or disc initially contacts a corner, designated l8 in Fig. 2, formed by juncture between two side faces [3 of the nut, which corner is angularly disposed to the plane of the cutter or disc.

To provide for the proper cooperation of the cutter or disc with the corner [8 or any surface of the nut to prevent any movement of the edge thereof relatively to the blank and to eliminate any tendency of the cutting member to warp or bend the corner H3 or surface of the blank which will initially be engaged by the cutter is chamfered or beveled, as-at l9, adjoining the extremity of the angularly disposed portion [6 of the inner face II. This creates a plane surface [9 at the point where the cutter first begins operation on the blank that will lie in a plane at right angles to the plane of the slot I! cut into the blank and consequently prior to the cutting or slotting operation will present a plane surface to the cutter at right angles to the plane of the latter. Thus the cutter in coming into contact with the nut blank operates against and over a plain surface located at right angles to its plane irrespective of the angular positions of the nut 10, the side faces I3 thereof, and of the corners formed by the junctures of said side faces.

It is manifest that the number of faces l3 provided on the nut I0 is immaterial to the effectiveness of the present invention as the cutter will always initially contact at a corner created by two adjoining faces or on a surface of one of the side faces I3 and this corner will be always at an angle to the cutter during the slotting operation. Hence that corner or face irrespective of the number of side faces the blank may have, is chamfered or beveled so that a part I of it will lie in a plane at right angles to the plane of the cutter during the cutting operation. If desired all of the other corners of the nut l0 may be similarly and correspondingly chamfered or beveled.

In Fig. 4 is shown a modification of the present invention, wherein the edge portion of the face is beveled or chamfered, as at 2|, as distinguished from chamfering or beveling merely the corner H; as in Figs. 1 to 3 inc. This produces a plane surface, as well as an edge, lying in a plane at right angles to the plane of the cutter and to the plane of the slot H in the ultimate nut. If desired this beveled or chamfered edge portion 2| may be repeated on each side face I3 of the nut adjacent the inner or lower face H thereof regardless of the number of these side faces.

Figs. 5 and 6 disclose a further modified form of the present invention. Here the side face [3 of the nut ID from which the slot I1 is to enter the body of the nut is provided with a shallow groove 22 transecting the corners of the blank at the ends of the grooved face. The cutter, as the nut blank is fed to it in the angular position wherein it is held to be slotted, enters this groove 22 and is prevented by it from flexing or bending because of any movement of its edge along an inclined surface or corner of the nut at the start of the slotting operation.

Should it be found desirable the groove 22 illustrated in Figs. 5 and 6 may be combined with either the bevel or chamfer 20 of the form of the invention disclosed in Figs, 1 to' 3 or with the bevel or chamfer 2| of that form illustrated in Fig. 4. In Figs. '7 and 8, the groove 22 is shown applied to the plane surface 2| created by the bevel or chamfer extending completely along the edge portion of one side face l3 of the nut I0. By so combining those forms of the invention a double insurance is provided for the proper cooperation of the cutter with the nut viz: a plane wise marring the outer surfaces of the nut by the cutter. invention is disclosed in Figs. 1 to 3 inc., the forms While the preferred form of the thereof shown in the other views are effective in carrying out the objects hereof and all forms of the device may be varied and further modified Without departing from the spirit and scope of this invention.

What is claimed is:

l. A lock nut blank comprising a body to be slotted angularly with respect to its faces, and means integral with and forming a part of said blank, having at least a portion thereof normal to the plane of a cutting tool for preventing any movement, other than the normal cutting movement, of the cutting tool relative to the nut at the start of the slotting thereof.

2. A nut blank comprising a body to be slotted angularly and a plane surface at the mouth of said slot positioned at right angles to the plane of said slot.

3. A nut blank comprising a body having an inner face, side faces and to be so slotted that the slot in said body has its mouth in one of said side faces and is disposed angularly to the planes of said side face and said inner face, and a plane surface at the mouth of said slot lying at right angles to the plane of the latter.

4. A nut blank comprising a body having an inner face, a side face and to be so slotted that the slot in said body has its mouth in said side face, the edge portion of the side face of the body adjacent the mouth of said slot being beveled to create a plane surface lying at right angles to the plane of said slot.

5. A nut blank comprising a body having an inner face, side faces and to be so slotted that the slot in said body has its mouth in one of said side faces and is disposed angularly to the planes of said faces, the corner between two of said side faces adjacent one end of the mouth of said slot being beveled or chamfered to create a plane surface lying at right angles to the plane of said slot.

6. A nut blank comprising a body having an inner face, Side faces and to be so slotted that theslot in said body has its mouth in one of said side faces and disposed at an acute angle to such side faces and to said inner face, the corner created by the juncture between the two adjoining side faces adjacent one end of the slot being beveled at an angle to each of such side faces to create a surface lying in a plane at right angles to the plane of the slot.

'7. A nut blank comprising a body having an inner face, a plurality of side faces and to be so slotted that the slot in said body is disposed at an angle to said faces and has its mouth disposed in one of said side faces, the corner of the body formed by the latter and the next adjoining side face being beveled at an angle to both of said side faces to create a flat surface lying in a plane at-right angles to the plane of the slot and extending across one end of the slot aforesaid.

8. A nut blank comprising abody having a side face and to be so slotted that the slot in said body terminates at its outer end in said side face, said side face being provided with a shallow groove therein at a point corresponding to the outer extremity of the slot prior to the placing of the slot in the nut, said groove having at least a portion thereof normal to the plane of cutting tool.

9. A nut blank comprising a body having a side face, a surface at an angle to said side face to lie in a plane at right angles to the plane of a cutting tool slotting said body, and a shallow groove in said surface at the point where said cutting tool is to operate.

10. A nut blank comprising a body having a pair of side faces meeting to form a corner, and a flat surface formed on said corner at an angle to both said side faces to lie in a plane at right angles to the plane of a cutting tool operating on said corner to slot said body at an angle to one of said faces.

WILLIAM A. BERGSTROM. 

